MP40 question
When choosing a power supply always validate it has a listing from any of : UL, CSA, TUV. In this case CE conformity is worthless.
Amazon is chock full of Chinese bottom barrel supplies which, as someone working in the electronics field and having seen a bunch of these, are highly variable in quality and often downright scary. I never use them.
The big three testing houses do enforce a minimum bar and really do improve safety.